Yet those familiar glows and flashes are just a tiny, easily observed fragment of a previously unexplored realm.

The treatment has raised previously unexplored ethical and regulatory questions.

It will facilitate the collection of multibeam measurements on a coalition of ships charting previously unexplored territory, while also serving as a repository of existing map data.

Before 1970, they were poorly studied, but recent interest has resulted in high rates of species description from previously unexplored mountain ranges.

In 28 days, they completed a trip of 228 miles through the high mountains, including several previously unexplored sections.